RK631

Siemens (& Halske, -Schuckert Werke SSW, Electrogeräte); Berlin, München

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  • Year
  • 1992 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 128683

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • 4
  • Main principle
  • Superheterodyne (common); ZF/IF 460/10700 kHz
  • Wave bands
  • Broadcast, Long Wave, more than 2 x SW plus FM or UHF.
  • Power type and voltage
  • Batteries / addl. power jack / AA 2 x 1.5 / DC 3 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 cm = 2 inch
  • Power out
  • 0.2 W (unknown quality)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: RK631 - Siemens & Halske, -Schuckert
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 140 x 105 x 37 mm / 5.5 x 4.1 x 1.5 inch
  • Notes

  • The portable Siemens RK631 G4 FM/MW/LW/SW world travel receiver is identical to the Sangean SG 600L.

    Main features:

    • Receiver bands
      • FM: 87.5-108 MHz
        • Integrated AFC 
      • LW: 150-281 kHz
      • MW: 522-1710 kHz
      • SW
        • SW1: 5.85-6.20 MHz (49m)
        • SW2: 7.10-7.5 MHz (41m)
        • SW3: 9.45-9.90 MHz (31m)
        • SW4: 11.60-12.10 MHz (25m)
        • SW5: 13.55-13.85 MHz (21m)
        • SW6: 15.10-15.60 MHz (19m)
        • SW7: 17.45-18.15 MHz (16m)
    • Tuning indicator
    • 6 mm external power socket (negative inner pole) for a 3 volts DC mains power supply
    • 3.5 mm external socket for headphones

    Technical details:

    The Receiver is designed around the TA8164P AM/FM Monaural Tuner (IC1) and the TA7331P Audio Power Amp (IC2).

    Accoding to the Toshiba datasheets, the TA7331P is able to deliver 200 mW over the internal 4 Ohm loudspeaker when working at 3 V.

    The FM band is handled directly by the TA8164P where the antenna signal goes thru a PFWB4 BPF (CF1). The FM AFC circuit is built around the RF transformer T3 (FM Det Quad), 2SC2839E Q3, 2SK212E Q4, 1N60 (D2, D3), 1N4148 (D4), and a SD116-T2 AFC varicap (D6). 

    To offer increased sensitivity over the seven SW bands, a discrete RF Front-End was included in the design, based on one 2SK212E N-Channel JFET (Q1).

    The FM IF uses 10.70 MHz as seen on the E10.7A IF filter (CF2), and the AM IF uses 460KHz as seen on the SFU460 IF filter (CF3).

    The tuning LED (D5) is driven by a 2SC3330T (Q2) that gets the signal from the TA8164P at pin 5, integrated by a 22uF cap (C30), thru a 1N60 diode (D1).

    There are two versions of the cabinet:

    • RK631 G4: black cabinet with gold printing
    • RK631 G6: grey cabinet with white printing

    Gross weight in original packing 450 gram

  • Net weight (2.2 lb = 1 kg)
  • 0.4 kg / 0 lb 14.1 oz (0.881 lb)
  • Source of data
  • -- Original prospect or advert
  • Literature/Schematics (1)
  • -- Original-techn. papers.
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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